Citizens for Transportation Mobility, Inc. registered with the state as a local ballot committee, so it doesn't have to compile any campaign contribution disclosure reports until 15 days before the election.

"I think that's just under the table. They're not doing what they're supposed to be doing," said Steve Brown, a spokesman for the Transportation Leadership Coalition, L.L.C., a grassroots group that opposes T-SPLOST.

"We give all our records out. We cite all our references. They should be doing the same thing," Brown said.

Representatives of Citizens for Transportation Mobility said the group registered as a local committee instead of a state committee because they're focused only on the 10-county metro Atlanta region, not the entire state.

11Alive News did get some campaign finance information from the group behind Untie Atlanta.